Johnson wasn't any good. What did he do against Vitali other than stand there right in front of him? You say he was worse against Joshua? Ok . But he was even worse when he took Vitali clone Filip Hrgović the distance. My point is that Vitali couldn't do to Kingpin what Joshua did to him because he didn't have the skills and attributes of Joshua which allowed him to blow Johnson apart. . Im also saying why should Vitali be favoured to beat Usyk when he never beat anybody even remotely close to him in terms of style and skill?
Usyk might have a shot here, he has a high work rate and could match Vitali in that regard Also, I think some of the cruiseweights he beat like Gassiev could have potentially beaten the best heavyweights Vitali beat
You are forgetting that Vitali has considerable physical advantages. Not to mention that Usyk has looked very average in his 2 heavyweight outing against subpar competition.